System for compatible transmission of high-resolution TV

Abstract

A high-resolution television system is described which provides twice the vertical resolution of present television standards and is compatible therewith. A high-resolution television camera substantially simultaneously provides information from each of a pair of adjacent scan lines; the luminance information of both lines is added to provide information for amplitude modulation onto a luminance carrier, while the difference in luminance of the two adjacent scan lines is utilized to modulate a carrier phased in quadrature with the luminance carrier. The chrominance values of both lines are added to modulate a chrominance carrier. The bandwidth of the resulting luminance and chrominance signals are compatible with that of a carrier modulated by a single raster line. At a television receiver, a synchronous quadrature detector provides the sum and difference luminance signals, which are then respectively added to and subtracted from one another to obtain the adjacent line luminance signals for display upon a picture tube in a high-definition television set. A standard television set utilizes only the additive luminance signal to display a compatible picture. Increased horizontal definition, by increasing transmitted signal bandwidth or by utilization of horizontal interlace, and/or increased chroma definition, may be utilized alone or in conjunction with increased vertical resolution to provide a total high-resolution television picture.

What is claimed is: 
     
       1. A method for increasing the vertical luminance resolution capacity of a transmitted television signal, comprising the steps of: (a) providing a television camera having a luminance video output signal of magnitude responsive to the visual luminance value at a raster spot then being scanned by a beam;   (b) scanning the beam through a plurality of lines in a horizontal direction;   (c) scanning the beam through each of a plurality L of different vertically-displaced lines during each of the plurality of horizontal line scans;   (d) generating a like plurality L of substantially simultaneous luminance signals each responsive to the luminance video output signal provided by the camera when the beam is at positions defined by the associated one of the plurality L of vertically-displaced lines; and   (e) modulating a different characteristic of at least one luminance carrier with each of the plurality L of luminance signals to transmit the increased vertical luminance resolution capacity television signal.   
     
     
       2. The method of claim 1, wherein a different pair of vertically-displaced lines are scanned during each of the plurality of horizontal line scans, and wherein step (c) comprises the steps of: generating a vertical scanning waveform for a standard number of horizontal line scans each substantially uniformly spaced from one another in a raster vertical direction; and superimposing another waveform upon the vertical scanning waveform to cause the beam to trace out, for each horizontal line scan, at least sequential portions of a pair of scanned lines lying adjacent to, and spaced from, one other and from all other lines scanned during each pair of interlaced frames. 
     
     
       3. The method of claim 2, wherein step (d) comprises the steps of: generating a first luminance signal responsive to the luminance video output signals provided by the camera only when the beam is at positions defined by a first one of the pair of scan lines; and generating a second luminance output signal responsive to the luminance video output signals provided by the camera only when the beam is at positions defined by a second one of the pair of scan lines. 
     
     
       4. The method of claim 3, further comprising the steps of: adding the first and second luminance signals to provide a summed-luminance signal; and subtracting the second luminance signal from the first luminance signal to provide a difference-luminance signal. 
     
     
       5. The method of claim 4, wherein step (e) comprises the steps of: amplitude modulating a first luminance carrier to transmit the summed-luminance signal; and simultaneously amplitude modulating a second luminance carrier in phase-quadrature with the first luminance carrier to transmit the difference-luminance signal. 
     
     
       6. The method of claim 5, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased-vertical resolution display capability; recovering the first and second luminance signals; scanning the beam of a display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; and alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines to display an increased vertical resolution television picture. 
     
     
       7. The method of claim 5, further comprising the steps of: providing the camera with an increased luminance video bandwidth greater than the video bandwidth necessary for transmitting a signal with normal horizontal resolution; and transmitting at least the modulated first luminance carrier with at least one of the upper and lower sidebands thereof having greater bandwidth than the bandwidth normally utilized for transmission of a normal-resolution television signal and containing the additional horizontal resolution information in the increased camerea video bandwidth. 
     
     
       8. The method of claim 7, wherein the lower sideband of the first carrier has a bandwidth greater than the upper sideband bandwidth. 
     
     
       9. The method of claim 7, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical and horizontal resolution display capability; recovering the first and second luminance signals; scanning the beam of display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines; and recovering the increased-horizontal-resolution information from the wide-bandwidth transmitted signal for displaying an increased horizontal and vertical resolution television picture. 
     
     
       10. The method of claim 7, wherein a color television signal is transmitted, further comprising the steps of: providing a chroma subcarrier in each of the upper and lower sidebands of the transmitted signal; and modulating each of the chroma subcarriers with different chroma information to provide a transmitted signal with increased chroma resolution capacity. 
     
     
       11. The method of claim 10, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical, horizontal and chroma resolution display capability; recovering the first and second luminance signals; scanning the beam of display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; and alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines to display an increased vertical resolution television picture; recovering the increased-horizontal-resolution information from the wide-bandwidth transmitted signal; and recovering the chroma information modulated onto each of the chroma subcarriers for providing increased vertical, horizontal and chroma resolution in the displayed television picture for displaying an increase-horizontal resolution-television picture. 
     
     
       12. The method of claim 9, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a display color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       13. The method of claim 6, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       14. The method of claim 5, further comprising the steps of: scanning the camera beam through a normal number of horizontal scan lines for a normal-resolution picture; sampling each horizontal line at a sampling frequency causing an integer number I of substantially equally-spaced successive samples to occur for each pixel defined in a normal-resolution horizontal line; selecting, for each successive one of a plurality number I of frames, similarly placed samples in each successive group of samples each having the integer number I of samples therein; forming each successive one of the integer number I of successive video frame waveforms from the successively selected sampled groups; and transmitting the successive video frame waveforms to provide a television picture having the integer number I of frames interlaced to provide a picture also having increased horizontal resolution when displayed. 
     
     
       15. The method of claim 14, wherein the integer multiple number I is equal to 2, and including the step of forming the video waveform, for each of a pair of alternating frames, of alternating ones of the totality of samples. 
     
     
       16. The method of claim 15, wherein the sampling frequency is an odd-integer multiple of one-half the frequency at which the horizontal lines are scanned. 
     
     
       17. The method of claim 16, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical and horizontal resolution display capability; scanning the beam of display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; recovering the first and second luminance signals; alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines; recovering the transmitted successive video frame waveforms at the receiver; sampling the recovered waveforms to obtain first frame samples; storing the first frame samples; recovering the stored first frame samples during a second frame time interval; sampling the stored samples to recover second frame samples; and alternately using the first and second frame samples to provide increased-horizontal-resolution luminance information for display of an increased vertical and horizontal resolution television picture at the receiver. 
     
     
       18. The method of claim 16, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical and horizontal resolution display capability; scanning the beam of display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; and recovering the first and second luminance signals; alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines; recovering the transmitted successive video frame waveforms at the receiver; sampling the recovered waveforms to obtain first frame samples; delaying the first frame samples successively by each of two time delays, each of the same duration as the horizontal line; averaging the non-delayed and twice-delayed samples; alternately selecting one of the once-delayed and averaged samples; and providing increased-horizontal-resolution luminance information, responsive to the alternately-selected samples, for display of a television picture at the receiver. 
     
     
       19. The method of claim 15, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       20. The method of claim 2, wherein the super-imposing step comprises the steps of: generating a bipolar, periodic, high-frequency sampling waveform; adding the sampling waveform to the vertical scanning waveform to provide the vertical deflection waveform; and moving the beam responsive to the vertical deflection waveform to periodically alternate the beam to positions above and below the position which would be occupied by beam reponsive solely to the vertical scanning waveform. 
     
     
       21. The method of claim 20, wherein step (d) comprises the steps of: sampling the camera video output signal at peaks in a first direction of the superimposed sampling waveform to generate video information for a first luminance signal; and sampling the camera video output signal at peaks in the opposite direction of the superimposed signal at peaks in the opposite direction of the superimposed sampling waveform to generate video information for a second luminance signal. 
     
     
       22. The method of claim 21, wherein the sampling waveform is generated at a frequency which is an integer multiple of the frequency at which the beam is horizontally line scanned. 
     
     
       23. The method of claim 22, wherein the sampling waveform frequency is on the order of three magnitudes greater than the horizontal line scanning frequency. 
     
     
       24. The method of claim 21, further comprising the steps of: adding the first and second luminance signals to provide a summed-luminance signal; and subtracting the second luminance signal from the first luminance signal to provide a difference-luminance signal. 
     
     
       25. The method of claim 24, wherein step (e) comprises the steps of: amplitude modulating a first luminance carrier to transmit the summed-luminance signal; and simultaneously amplitude modulating a second luminance carrier in phase-quadrature with the first luminance carrier to transmit the difference-luminance signal. 
     
     
       26. The method of claim 25, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased-vertical-resolution display capability; synchronously quadrature detecting the received carriers to recover the summed-luminance and difference-luminance signals; generating the sampling signal at the receiver; generating the vertical scanning waveform of the receiver; adding the sampling signal to the vertical scanning waveform to provide a waveform for vertically deflecting a beam in a display device at the receiver; modulating the sampling signal with the recovered difference-luminance signal; and adding the modulated sampling signal and the summed-luminance signal to control the intensity of the display device beam to display an increased vertical resolution television picture. 
     
     
       27. The method of claim 26, further comprising the step of locking the sampling signals at the receiver and the transmitter to one another. 
     
     
       28. The method of claim 27, wherein a color television signal is being transmitted and received, and further comprising the step of using a chroma subcarrier signal as the sampling signal. 
     
     
       29. The method of claim 28, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       30. The method of claim 25, further comprising the steps of: providing the camera with an increased luminance video bandwidth greater than the video bandwidth necessary for transmitting a signal with normal horizontal resolution; and transmitting at least the modulated first luminance carrier with at least one of the upper and lower sidebands thereof having greater bandwidth than the bandwidth normally utilized for transmission of a normal-resolution television signal and containing the additional horizontal resolution information in the increased camera video bandwidth. 
     
     
       31. The method of claim 30, wherein the lower sideband of the first carrier has a bandwidth greater than the upper sideband bandwidth. 
     
     
       32. The method of claim 31, wherein a color television signal is transmitted, further comprising the steps of: providing a chroma subcarrier in each of the upper and lower sidebands of the transmitted signal; and modulating each of the chroma subcarriers with different chroma information to provide a transmitted signal with increased chroma resolution capacity. 
     
     
       33. The method of claim 32, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical, horizontal and chroma resolution display capability; synchronously quadrature detecting the received carriers to recover the summed-luminance and difference-luminance signals; generating the sampling signal at the receiver; generating the vertical scanning waveform of the receiver; adding the sampling signal to the vertical scanning waveform to provide a waveform for vertically deflecting a beam in a display device at the receiver; modulating the sampling signal with the recovered difference-luminance signal; adding the modulated sampling signal and the summed-luminance signal to control the intensity of the display device beam to display an increased vertical resolution television picture; recovering the increased-horizontal-resolution information from the wide-bandwidth transmitted signal; and recovering the chroma information modulated onto each of the chroma subcarriers for providing increased chroma resolution in a displayed television picture having increased vertical, horizontal and chroma resolution. 
     
     
       34. The method of claim 30, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical and horizontal resolution display capability; synchronously quadrature detecting the received carriers to recover the summed-luminance and difference-luminance signals; generating the sampling signal at the receiver; generating the vertical scanning waveform of the receiver; adding the sampling signal to the vertical scanning waveform to provide a waveform for vertically deflecting a beam in a display device at the receiver; modulating the sampling signal with the recovered difference-luminance signal; adding the modulated sampling signal and the summed-luminance signal to control the intensity of the display device beam to display an increased vertical resolution television picture; and recovering the increased-horizontal-resolution information from the wide-bandwidth transmitted signal for displaying an increased-vertical and horizontal resolution-television picture. 
     
     
       35. The method of claim 34, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       36. The method of claim 35, further comprising the steps of: scanning the camera beam through a normal number of horizontal scan lines for a normal-resolution picture; sampling each horizontal line at a sampling frequency causing an integer number I of substantially equally-spaced successive samples to occur for each pixel defined in a normal-resolution horizontal line; selecting, for each successive one of a plurality number I of frames, similarly placed samples in each successive group of samples each having the integer number I of samples therein; forming each successive one of the integer number I of successive video frame waveforms from the successively selected sampled groups; and transmitting the successive video frame waveforms to provide a television picture having the integer number I of frames interlaced to provide a picture also having increased horizontal resolution when displayed. 
     
     
       37. The method of claim 36, wherein the integer multiple number I is equal to 2, and including the step of forming the video waveform, for each of a pair of alternating frames, of alternating ones of the totality of samples. 
     
     
       38. The method of claim 37, wherein the sampling frequency is an odd-integer multiple of one-half the frequency at which the horizontal lines are scanned. 
     
     
       39. The method of claim 38, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical and horizontal resolution display capability; scanning the beam of display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; recovering the first and second luminance signals; alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines; recovering the transmitted successive video frame waveforms at the receiver; sampling the recovered waveforms to obtain first frame samples; storing the first frame samples; recovering the stored first frame samples during a second frame time interval; sampling the stored samples to recover second frame samples; and alternately using the first and second frame samples to provide increased-horizontal-resolution luminance information for display of an increased vertical and horizontal resolution television picture at the receiver. 
     
     
       40. The method of claim 38, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical and horizontal resolution display capability; scanning the beam of display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; and recovering the first and second luminance signals; alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines; recovering the transmitted successive video frame waveforms at the receiver; sampling the recovered waveforms to obtain first frame samples; delaying the first frame samples successively by each of two time delays, each of the same duration as the horizontal line; averaging the non-delayed and twice-delayed samples; alternately selecting one of the once-delayed and averaged samples; and providing increased-horizontal-resolution luminance information, responsive to the alternately-selected samples, for display of a television picture at the receiver. 
     
     
       41. The method of claim 37, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       42. The method of claim 2, wherein step (b) includes the step of doubling the number of horizontal line scans in the raster; and the superimposing step comprises the steps of: generating a bipolar square waveform having a frequency equal to one-half the doubled frequency at which the beam is horizontally line scanned; adding the square waveform to the vertical scanning waveform to provide a vertical deflection waveform; and moving the beam in the vertical direction responsive to the vertical deflection waveform to positions along a different one of a multiplicity of horizontal lines, equal in number to twice that in a normal resolution raster. 
     
     
       43. The method of claim 42, wherein step (d) comprises the steps of: dividing each of the multiplicity of horizontal scan lines in a raster into sequential groups of four individual lines; providing a first clock signal at a frequency twice that of a second clock signal; storing, at the first clock frequency and in a first storage means, the camera luminance video output signal responsive to a first line of each group being scanned by the beam; storing, at the first clock frequency and in a second storage means, the camera luminance video output signal responsive to a second line of each group being scanned by the beam; storing, at the first clock frequency and in a third storage means, the camera luminance video output signal responsive to a third line of each group; storing, at the first clock frequency and in a fourth storage means, the camera luminance video output signal, responsive to a fourth line of each group; simultaneously reading out at the second clock frequency the camera luminance video signals for the first and second lines respectively from the respective first and second storage means while the third and fourth lines of each group are being stored; then simultaneously reading out at the second clock frequency the camera luminance video signals for the third and fourth lines respectively from the respective third and fourth storage means while the first and second lines of a next-subsequent group are being stored; forming a first luminance signal from the first and third line signals sequential read-out of the first and third storage means; and forming a second luminance signal from the second and fourth line signals sequentially read out of the second and fourth storage means. 
     
     
       44. The method of claim 43, further comprising the steps of: adding the first and second luminance signals to provide a summed-luminance signal; and subtracting the second luminance signal from the first luminance signal to provide a difference-luminance signal. 
     
     
       45. The method of claim 44, wherein step (e) comprises the steps of: amplitude modulating a first luminance carrier to transmit the summed-luminance signal; and simultaneously amplitude modulating a second luminance carrier in phase-quadrature with the first luminance carrier to transmit the difference-luminance signal. 
     
     
       46. The method of claim 45, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased-vertical-resolution display capability; synchronously quadrature detecting the received carriers to recover the summed-luminance and difference-luminance signals; doubling a received horizontal synchronization signal for providing a doubled-horizontal-frequency horizontal line scan waveform; generating the vertical scanning waveform at the receiver; providing a square waveform at the horizontal frequency; adding the square waveform to the vertical scanning waveform to provide a waveform for vertically deflecting a beam in a display device at the receiver, which beam is also horizontally deflected by the doubled-horizontal-frequency waveform; adding the summed-luminance and difference-luminance signals to provide a first luminance signal; subtracting the difference-luminance signal from the summed-luminance signal to provide a second luminance signal; storing the first and second luminance signals at a first clock rate; and alternately reading out the stored first and second luminance signals in first and second repetitions at a second clock rate, to control the intensity of the display device beam to display an increased vertical resolution television picture. 
     
     
       47. The method of claim 46, further comprising the step of locking the horizontal-frequency square waveforms at the receiver and transmitter to one another. 
     
     
       48. The method of claim 46, wherein a color television signal is being transmitted and received, and further comprising the steps of: recovering the color video information at the receiver; storing the color video information at the first clock rate in first and second registers; and alternately reading out the stored color video information from the first and second registers in two repetitions at the second clock rate and in synchronism with the luminance signals, to provide color information for the displayed picture. 
     
     
       49. The method of claim 46, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received color video information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color video information. 
     
     
       50. The method of claim 45, further comprising the steps of: providing the camera with an increased luminance video bandwidth greater than the video bandwidth necessary for transmitting a signal with normal horizontal resolution; and transmitting at least the modulated first luminance carrier with at least one of the upper and lower sidebands thereof having greater bandwidth than the bandwidth normally utilized for transmission of a normal-resolution television signal and containing the additional horizontal resolution information in the increased camerea video bandwidth. 
     
     
       51. The method of claim 50, wherein the lower sideband of the first carrier has a bandwidth greater than the upper sideband bandwidth. 
     
     
       52. The method of claim 51, wherein a color television signal is transmitted, further comprising the steps of: providing a chroma subcarrier in each of the upper and lower sidebands of the transmitted signal; and modulating each of the chroma subcarriers with different chroma information to provide a transmitted signal with increased chroma resolution capacity. 
     
     
       53. The method of claim 52, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical, horizontal and chroma resolution display capability; synchronously quadrature detecting the received carriers to recover the summed-luminance and difference-luminance signals; doubling a received horizontal synchronization signal for providing a doubled-horizontal-frequency horizontal line scan waveform; generating the vertical scanning waveform at the receiver; providing a square waveform at the horizontal frequency; adding the square waveform to the vertical scanning waveform to provide a waveform for vertically deflecting a beam in a display device at the receiver, which beam is also horizontally deflected by the doubled-horizontal-frequency waveform; adding the summed-luminance and difference-luminance signals to provide a first luminance signal; subtracting the difference-luminance signal from the summed-luminance signal to provide a second luminance signal; storing the first and second luminance signals at a first clock rate; alternately reading out the stored first and second luminance signals in first and second repetitions at a second clock rate, to control the intensity of the display device beam; and recovering the chroma information modulated onto each of the chroma subcarriers for providing increased chroma resolution, to display a television picture having increased vertical, horizontal and chroma resolution. 
     
     
       54. The method of claim 50, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased-vertical-resolution display capability; synchronously quadrature detecting the received carriers to recover the summed-luminance and difference-luminance signals; doubling a received horizontal synchronization signal for providing a doubled-horizontal-frequency horizontal line scan waveform; generating the vertical scanning waveform at the receiver; providing a square waveform at the horizontal frequency; adding the square waveform to the vertical scanning waveform to provide a waveform for vertically deflecting a beam in a display device at the receiver, which beam is also horizontally deflected by the doubled-horizontal-frequency waveform; adding the summed-luminance and difference-luminance signals to provide a first luminance signal; subtracting the difference-luminance signal from the summed-luminance signal to provide a second luminance signal; storing the first and second luminance signals at a first clock rate; alternately reading out the stored first and second luminance signals in first and second repetitions at a second clock rate, to control the intensity of the display device beam; and recovering the increased-horizontal-resolution information from the wide-bandwidth transmitted signal for display an increased-vertical and horizontal resolution television picture. 
     
     
       55. The method of claim 50, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       56. The method of claim 45, further comprising the steps of: scanning the camera beam through a normal number of horizontal scan lines for a normal-resolution picture; sampling each horizontal line at a sampling frequency causing an integer number I of substantia11y equally-spaced successive samples to occur for each pixel defined in a normal-resolution horizontal line; selecting, for each successive one of a plurality number I of frames, similarly placed samples in each successive group of samples each having the integer number I of samples therein; forming each successive one of the integer number I of successive video frame waveforms from the successively selected sampled groups; and transmitting the successive video frame waveforms to provide a television picture having the integer number I of frames interlaced to provide a picture also having increased horizontal resolution when displayed. 
     
     
       57. The method of claim 56, wherein the integer multiple number I is equal to 2, and including the step of forming the video waveform, for each of a pair of alternating frames, of alternating ones of the totality of samples. 
     
     
       58. The method of claim 57, wherein the sampling frequency is an odd-integer multiple of one-half the frequency at which the horizontal lines are scanned. 
     
     
       59. The method of claim 58, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical and horizontal resolution display capability; scanning the beam of a display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; recovering the first and second luminance signals; alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines; recovering the transmitted successive video frame waveforms at the receiver; sampling the recovered waveforms to obtain first frame samples; storing the first frame samples; recovering the stored first frame samples during a second frame time interval; sampling the stored samples to recover second frame samples; and alternately using the first and second frame samples to provide increased-horizontal-resolution luminance information for display of an increased vertical and horizontal resolution television picture at the receiver. 
     
     
       60. The method of claim 58, further comprising the steps of: receiving the modulated luminance carriers at a receiver having an increased vertical and horizontal resolution display capability; scanning the beam of display device in the receiver to a different pair of vertically-displaced lines during each of a plurality of horizontal line scans; recovering the first and second luminance signals; alternately controlling the intensity of the beam with one of the first and second luminance signals during scanning of an associated one of each pair of vertically-displaced lines; recovering the transmitted successive video frame waveforms at the receiver; sampling the recovered waveforms to obtain first frame samples; delaying the first frame samples successively by each of two time delays, each of the same duration as the horizontal line scan; averaging the non-delayed and twice-delayed samples; alternately selecting one of the once-delayed and averaged samples; and providing increased-horizontal-resolution luminance information responsive to the alternately-selected samples, for display of an increased vertical and horizontal resolution television picture at the receiver. 
     
     
       61. The method of claim 57, further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the received luminance information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a displayed color television picture also having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       62. A method for increasing the horizontal luminance resolution of a television signal, comprising the steps of: generating a raster scan waveform having a standard number of horizontal and vertical scan lines in a display raster;   providing a camera having a luminance video output of magnitude responsive to the visual luminance value at a spot on said raster then being scanned by a beam responsive to said raster scan waveform;   providing the camera with a luminance video bandwidth greater than the normal video bandwidth utilized with a raster having the standard number of scan lines; and   transmitting the luminance video output of said camera as a modulated carrier signal having a lower sideband of bandwidth greater than an upper sideband and with a total bandwidth substantially greater than the bandwidth normally utilized for transmitting a television signal having the normal scan line video signal.   
     
     
       63. The method of claim 62, furhter including the steps of: receiving the greater-bandwidth carrier signal at a receiver having an increased horizontal resolution capacity; and recovering the increased-horizontal-resolution information for displaying an increased horizontal resolution television picture. 
     
     
       64. The method of claim 63, wherein a color television signal is transmitted, and further comprising the steps of: recovering chroma information from the received color signal, characterizing the sharpness of luminance edges from the received luminance video information; and modifying the received chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       65. The method of claim 62, further comprising the steps of: providing a chroma subcarrier in each of the upper and lower sidebands of the transmitted signal; and modulating each of the chroma subcarriers with different chroma information to provide a transmitted signal with increased chroma resolution. 
     
     
       66. The method of claim 65, further including the steps of: receiving the greater-bandwidth carrier signal at a receiver having an increased horizontal and chroma resolution capacity; and recovering the chroma information modulated onto each of the chroma subcarriers for providing increased chroma resolution. 
     
     
       67. A method for increasing the horizontal luminance resolution of a television signal, comprising the steps of: providing a television camera having a high horizontal video resolution capability; scanning a camera beam through a normal number of horizontal scan lines for a normal-resolution picture; sampling the luminance values along each horizontal scan line at a sampling frequency causing an integer number I of substantially equally-spaced successive samples to occur for each pixel defined in a normal-resolution horizontal line; selecting, for each successive one of a plurality I of frames, similarly placed samples in each successive group of samples each having the integer number I of samples therein; forming each successive one of the integer number I of successive video frame waveforms from the successively selected sampled groups; and transmitting the successive video frame waveforms to provide a television picture having the integer number I of frames interlaced to provide a picture also having increased horizontal resolution when displayed. 
     
     
       68. The method of claim 67, wherein the integer multiple number I is equal to 2, and including the step of forming the video waveform, for each of a pair of alternating frames, of alternating ones of the totality of samples. 
     
     
       69. The method of claim 68, wherein the sampling frequency is an odd-integer multiple of one-half the frequency at which the horizontal lines are scanned. 
     
     
       70. The method of claim 69, further comprising the steps of: recovering the transmitted successive video frame waveform at a receiver having an increased horizontal resolution display capability; sampling the recovered waveforms to obtain first frame samples; storing the first frame samples; recovering, during a second frame time interval, the stored first frame samples; sampling the stored samples during the second frame time interval to recover second frame samples; and alternately using the first and second frame samples to provide increased-horizontal-resolution luminance information for display of an increased resolution television picture at the receiver. 
     
     
       71. The method of claim 70, wherein a color television signal is transmitted with chroma information, and further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the recovered luminance information at the receiver; recovering the transmitted chroma information at the receiver; and modifying the recovered chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       72. The method of claim 69, further comprising the steps of: recovering the transmitted successive video frame waveforms at a receiver having an increased horizontal resolution display capability; sampling the recovered waveforms to obtain first frame samples; delaying the first frame samples successively by each of two time delays, each of the same duration as the horizontal scan line; averaging the non-delayed and twice-delayed samples; alternately selecting one of the once-delayed and averaged samples; and providing increased-horizontal-resolution luminance information, responsive to the alternately-selected samples, for display of a television picture at the receiver. 
     
     
       73. The method of claim 72, wherein a color television signal is transmitted with chroma information, and further comprising the steps of: extracting information characterizing the sharpness of luminance edges from the recovered luminance information at the receiver; recovering the transmitted chroma information at the receiver; and modifying the recovered chroma information responsive to the extracted luminance edge information to provide a displayed color television picture having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information. 
     
     
       74. A method for increasing chroma resolution in a received color television signal, comprising the steps of: recovering luminance information from the received television signal;   recovering chroma information from the received television signal;   extracting information characterizing the sharpness of luminance edges from the recovered luminance information; and   modifying the recovered chroma information, responsive to the extracted luminance edge information, to increase the sharpness of chroma edges and provide a displayed color television signal having an increased color resolution relative to the color resolution of a picture displayed with unmodified color information.   
     
     
       75. The method of claim 74, wherein the luminance edge information extracting step comprises the steps of: detecting the amplitude of each luminance edge; and generating an edge correction waveform having an abrupt polarity-reversal portion occurring substantially at the mid-point of each luminance edge and having amplitude and polarity responsive to the amplitude and polarity of the luminance edge. 
     
     
       76. The method of claim 75, wherein the received chroma information is provided as at least one chroma waveform; and the information modifying step includes the steps of: detecting the amplitude of each of the at least one chroma waveform; adjusting, for each chroma waveform, the polarity of the detected luminance edge amplitude waveform to correspond to the polarity of the associated one of the at least one chroma waveform; adjusting, for each chroma waveform, the polarity of the error correction waveform responsive to the associated polarity adjustment of the luminance edge amplitude waveform; adjusting, for each chroma waveform, the amplitude of the associated polarity-adjusted edge correction waveform responsive to a comparison between the associated corrected-polarity luminance edge amplitude waveform and the amplitude of the associated chroma waveform; and adding each of the at least one gain-and-polarity-corrected edge correction waveform to the associated one of the at least one chroma waveform to provide a like number of at least one edge-sharpened chroma waveform for displaying a color television picture at the receiver. 
     
     
       77. Apparatus for transmitting a television signal with increased vertical resolution, comprising: first means for providing a horizontal line scanning waveform;   second means for providing a vertical line scanning waveform;   at least one camera tube having at least one beam scanned to a raster position responsive to the vertical and horizontal line scanning waveforms for providing at least one video signal of amplitude responsive to the amount of light impinging upon the spot at which the associated camera beam is then positioned;   third means for providing another waveform combinable with said vertical line scanning waveform for causing each of the said at least one camera beam to scan at least consecutive portions of a plurality of vertically-displaced and non-overlapping lines during each horizontal scan; and   a plurality of means each for sampling and holding the amplitude of the video waveform output from each of the at least one camera tube whenever said at least one beam is at a point defining an associated one of said plurality of vertically-displaced lines, each of said sampling and holding means providing one of a like plurality of sequential vertical line video waveforms for transmission.   
     
     
       78. The apparatus of claim 77, wherein: said third means provides said another waveform of substantially sinusoidal shape; a pair of vertically-displaced lines are scanned during each horizontal scan; and said sampling and holding means associated with each camera tube includes a pair of sample-and-hold circuits receiving the associated camera video waveform, with a first one of said circuits being strobed to operate at each successive one of the positive-polarity peaks of said another waveform and the second one of said circuits being strobed to operate at each successive one of the negative-polarity peaks of said another waveform, to provide first and second luminance signals. 
     
     
       79. The apparatus of claim 78, further comprising: means for adding the first and second luminance signals to provide a summed-luminance signal; means for subtracting the second luminance signal from the first luminance signal to provide a difference-luminance signal; means for providing first and second transmission carriers at the same frequency and in quadrature phase with one another; means for modulating the first carrier signal with the summed-luminance signal; means for modulating the second carrier signal with the difference-luminance signal; and means for adding the first and second modulated carrier signals to provide a high-resolution-vertical television signal for transmission. 
     
     
       80. The apparatus of claim 79, wherein color television signals are to be transmitted, said apparatus including a plurality of color camera tubes and sampling means providing a like plurality of sampled-and-held signals; and further including means for matrixing the plurality of sampled-and-held first and second luminance signals to provide the first and second luminance signals to said adding and subtracting means. 
     
     
       81. The apparatus of claim 78, further comprising: a receiver having an increased-vertical-resolution display device; means for providing said another waveform at the receiver; means for synchronously quadrature detecting the television signal transmitted to the receiver to recover at least the summed-luminance and difference-luminance signals; means for modulating the another waveform with the difference-luminance signal; and means for adding the output of the modulating means to the summed-luminance signal to provide luminance information for display of an increased-vertical-resolution picture on the receiver display device. 
     
     
       82. Apparatus for transmitting a television signal with increased vertical resolution, comprising: first means for providing a horizontal line scanning waveform at a frequency equal to an even-integer multiple of a normal horizontal scanning frequency;   second means for providing a vertical line scanning waveform;   third means for providing a square waveform at a frequency equal to one-half the horizontal line scanning frequency provided in said first means;   means for combining said vertical line scanning waveform and said another waveform to provide a vertical deflection waveform;   at least one camera tube having at least one beam scanned to a raster position responsive to the vertical deflection and horizontal line scanning waveforms for providing at least one video signal of amplitude responsive to the amount of light impinging upon the spot at which the associated camera beam is then positioned; and   means for consecutively storing the video signals produced during scanning of a plurality of horizontal line scans and for simultaneously reading out another plurality of nonconsecutive stored video signals to provide a like plurality of video luminance waveforms for transmission.   
     
     
       83. The apparatus of claim 82, wherein the integral multiple is 2, and said storing and reading out means includes: four line storage means each having a storage input and an output; first switching means for sequentially connecting the video signal from an associated camera tube to the storage input of sequential ones of the line storing means; clock means for causing each storage means to store video information at a first rate whenever the line storage means input is connected through said first switching means to receive the camera video signal and for reading out the signal from the output of that storing means at one-half the storing rate; and second switching means receiving the output of each line storing means for providing a first video luminance waveform alternately from the output of the first and third line storage means, and for providing a second video luminance waveform alternately from the output of the second and fourth line storage means. 
     
     
       84. The apparatus of claim 83, further comprising: means for adding the first and second luminance signals to provide a summed-luminance signal; means for subtracting the second luminance signal from the first luminance signal to provide a difference-luminance signal; means for providing first and second transmission carriers at the same frequency and in quadrature phase with one another; means for modulating the first carrier signal with the summed-luminance signal; means for modulating the second carrier signal with the difference-luminance signal; and means for adding the first and second modulated carrier signals to provide a high resolution-vertical television signal for transmission. 
     
     
       85. The apparatus of claim 84, wherein color television signals are to be transmitted, said apparatus including a plurality of color camera tubes and a like plurality of storing means each providing the same plurality of first and second luminance signals; and further comprising means for matrixing the plurality of first and second luminance signals to provide the first luminance signals to said adding and subtracting means. 
     
     
       86. The apparatus of claim 83, further comprising: a receiver having an increased-vertical-resolution display device; means for synchronously quadrature detecting the television signal transmitted to the receiver to recover at least the summed-luminance and difference-luminance signals; means for adding and subtracting the summed-luminance and difference-luminance signals to recover the first and second luminance signals; means for storing each of the first and second luminance signals at a first rate and for reading out each of the stored signals at a rate twice as great as the first rate; means for providing a double-horizontal-frequency horizontal line scanning waveform to said display device; and means for detecting the proper phase of the doubled-horiziontal-frequency waveform for synchronizing connection of the proper one of the read-out first and second luminance waveforms to the display device for displaying the proper luminance information for an increased-vertical-resolution picture. 
     
     
       87. Apparatus for transmitting a television signal with increased horizontal luminance resolution, including: means for generating a raster scan waveform having a standard number of vertical and horizontal scan lines in the display raster;   a television camera having a luminance video output of magnitude responsive to the video luminance value at a spot on said raster then being scanned by a camera beam responsive to said raster scan waveform, said camera having a luminance video bandwidth greater than the normal bandwidth utilized with a raster having the standard number of scan lines; and   means for transmitting the luminance video output of the camera as a modulated carrier signal having a lower sideband of bandwidth greater than an upper sideband bandwidth and a total bandwidth substantially greater than the bandwidth normally utilized for transmitting a television signal having a normal scan line video signal.   
     
     
       88. The apparatus of claim 87, further comprising a receiver having: a display device of increased horizontal resolution capability; and means for recovering video luminance information of greater bandwidth than the video bandwidth normally utilized with a normal horizontal resolution picture, for providing luminance information to the receiver display device to display an increased horizontal resolution television picture. 
     
     
       89. The apparatus of claim 88, wherein the transmitter further comprises: means for transmitting first and second chroma subcarriers, each chroma subcarrier being in a different one of the upper and lower sidebands of the transmitted signal; means for modulating different chroma information upon each of the first and second chroma subcarriers; and the receiver further comprises: means for recovering chroma information from each of the first and second subcarriers received at said receiver for displaying an increased horizontal resolution color television picture on the display device thereof. 
     
     
       90. Apparatus for increasing the horizontal luminance resolution of a television picture, comprising: a television camera having a high horizontal resolution capability;   means for scanning a beam of the camera through a normal number of horizontal scan lines for a normal resolution picture;   means for sampling the luminescence values along each horizontal scan line of a sampling frequency causing an integer number I of substantially equally-spaced successive samples to recover each pixel defined in a normal-resolution-horizontal line;   means for selecting, for each successive one of a plurality I frames, similarly placed samples in each successive group of samples each having the integer number I of samples therein;   means for forming each successive one of the integer number I of successive video frame waveforms from the successively selected sample group; and   means for sequentially transmitting the successive video frame waveforms, to provide a television signal representing a picture having the integer number I of frames interlaced to provide a picture increased horizontal resolution when displayed at a receiver.   
     
     
       91. The apparatus of claim 90, wherein the integer multiple I is equal to 2; and the video waveform forming means is a means for forming each of a pair of alternating frame video waveforms from alternating ones of the totality of samples. 
     
     
       92. The apparatus of claim 91, wherein the sampling frequency is an odd-integer multiple of one-half the frequency at which the horizontal lines are scanned. 
     
     
       93. The apparatus of claim 92, further comprising a receiver including: a device for displaying a television signal with increased horizontal resolution; means for recovering the transmitted successive video frame waveforms; means for sampling the recovered waveforms to obtained first frame samples; means for storing the first frame samples; means for recovering, during a second frame time interval, the stored first frame samples; means for sampling the stored samples during the second frame time interval to recover second frame samples; and means for alternatingly providing the first and second frame samples to the display device for display of an increased horizontal resolution television picture thereon. 
     
     
       94. The apparatus of claim 92, further comprising a receiver including: a device for displaying a television signal with increased horizontal resolution; means for recovering the transmitted successive video frame waveforms; means for sampling the recovered waveforms to obtain first frame samples; first and second means for successively delaying the first frame samples each by a time delay having the same duration as the horizontal scan line; means for averaging the non-delayed sample and the sample after passage through the first and second delaying means; and means for alternately selecting the output from the sampling means and the first delaying means for providing luminance information to the display device for display of an increased horizontal resolution television picture thereon. 
     
     
       95. Apparatus for increasing chroma resolution in a color television receiver, comprising: means for recovering luminance information from a received television signal;   means for recovering chroma information from a received color television signal;   means for extracting information characterizing the sharpness of luminance edges from the recovered luminance information; and   means for modifying the recovered chroma information, responsive to the extracted luminance edge information, to enhance the sharpness of chroma edges and increase color resolution in a color picture displayed, responsive to the modified chroma information and the recovered luminance information, relative to the color resolution of a picture displayed on the same device with unmodified color information.   
     
     
       96. The apparatus of claim 95, wherein the luminance edge information extracting means comprises: means for detecting the amplitude of each luminance edge; and means for generating an edge correction waveform having an abrupt polarity-reversal portion occurring substantially at the midpoint of each luminance edge and having amplitude and polarity responsive to the amplitude and polarity of the luminance edge. 
     
     
       97. The apparatus of claim 96, wherein at least one of the amplitude detecting means and the correction waveform generating means include a weighted-summation network. 
     
     
       98. The apparatus of claim 96, wherein the received chroma information is provided as at least one chroma waveform and wherein, for each chroma waveform provided in the receiver, the chroma modifying means includes: means for detecting the amplitude of the associated chroma waveform; first means for adjusting the polarity of the detected luminance edge amplitude waveform to correspond to the polarity of the associated chroma waveform; second means for adjusting the polarity of the error correction waveform responsive to adjustment of the luminance edge amplitude waveform in the associated first adjusting means; means for comparing the associated corrected-polarity luminance edge amplitude waveform and the amplitude of the associated chroma waveform in the second adjusting means to provide a gain adjustment signal; means for comparing the associated corrected-polarity luminance edge amplitude waveform and the amplitude of the associated chroma waveform in the second adjusting means to provide a gain adjustment signal; third means for adjusting the amplitude of the associated polarity-adjusted edge correction waveform from the second adjusting means, responsive to the gain adjusting signal; and means for adding each of the gain-and-polarity corrected edge correction waveform to the associated chroma waveform to provide an edge-sharpened chroma waveform for use in displaying a color television picture with increased chroma resolution on the receiver display device.